Re: Packard TSB 56T-20 - Low Oil Pressure

Posted by PackardV8 On 2009/10/25 22:01:28

JV writes:
"I'm 99% sure the wear is caused by harmonics in the very long driveshaft caused by the loose-fitting-two-flat-drive-tangs. Most modern oil pumps, including the Oldsmobile, use a hex-drive which fits tighter and doesn't have the stop-start of the two flats. This oscillation works on the too-short bearing in the top of the oil pump body and wears it. When the oil level drops below the level of the top of the pump, it wears even more rapidly"

THEREFORE, any Packard V8 oil pump rebuild that closely resembles original factory specs will still be subject to the same premature wear and related problems that the pump had when it left the factory.